"Spread the word guys, mums and dads need to know. Make sure you're all checking lids before opening or even buying formula," Mr Fitchett wrote.
Since news of the 1080 threat broke, supermarkets have ramped up security -- with some keeping the tins behind counters and others positioning CCTV cameras for surveillance on shelves.
The threat stemmed from anonymous letters sent to Fonterra and Federated Farmers in November saying infant formula products would be laced with 1080 pesticide at the end of March unless the Government ceased using the poison.
"A number of tins of product have been collected and secured by police and all information relating to the incidents has been provided to the Operation Concord team and is in the process of being assessed," said Mr Burgess. "Tins of formula are being forensically tested."
Foodstuffs, which owns Pak'nSave and New World, said it knew of one customer who had been concerned about tampering.
"We are aware a customer had a concern that a tin of infant formula may have been tampered with and has handed it to police," Foodstuffs NZ managing director Steve Anderson said.
Speaking to Radio New Zealand this morning, Mr Fitchett said his partner had noticed holes in the top and bottom of a tin of formula they had purchased.
"My partner opened it and noticed holes in the tinfoil in the top, and as you would, she panicked a bit, and didn't want to feed it to our child, so she just contacted the Government helplines and they sent the police around."
There were around six to ten holes around the edge of the tin, Mr Fitchett said.
"When you take off the plastic lid there is a foil seal there, it was just through that.
"The formula didn't look different itself, we didn't really inspect it though, we sort of left it to the police."
Mr Fitchett said despite this, it had not put him or his partner off using formula.
"We're still using it we are just a lot more vigilant - especially when we buy it, we'll be checking it before we even buy it from the shop.
"We don't want people to freak out and stop using it, we just want people to be aware that this isn't just threats, it's actually quite real so they need to be checking it properly."
Mr Fitchett said he was "unsure" as to whether there was any connection between threats made in November and his 'tampered' tin of baby formula.
"But we're not prepared to take that risk, as any parent would, I'm sure no parent would feed their kid formula that looks like it had been tampered with."
He said it could be a "copycat".
"That would be quite disturbing if someone would go and do something like that, especially when everyone's on edge."
Chair of the Infant Formula Exporters Association Michael Barnett said "copycat" behaviour was always going to be of concern after the police went public with information of the threats.
"This was always the problem when you go public. One of the things we said earlier on in the whole process was that if you do go public there is an opportunity that copycats are going to come through and try and take advantage of the situation.
"I think the police have clearly said there is no risk - but I think that the point to go public on something like this is it needs to be followed up with excellent communication.:
Mr Barnett said he did not believe there was enough "communication" at the moment.
"I think good information actually stops people siting back and wondering, and asking questions. I think a good line of communication right now would be helpful."
Police assistant commissioner Malcolm Burgess told Radio New Zealand this morning that suggestions tins had been tampered with were "premature".
He said any defects to tins were more likely caused by damage from careless handling.
However, he said police would be "foolish" not to follow up and check to ensure this assessment was sound.
"There's no evidence at all they have been tampered with - it's actually damage to the product by careless handling.
"We are confident this is the case but are going to do the sensible thing and take the necessary precaution and have these things tested."
Mr Burgess said in the case of Mr Fitchett and his partner, they was no confirmation that the tin had been damaged by pin pricks.
"The indications are that this may be a fault in terms of manufacturing process, we are assessing that and having that evaluated.
"I think to say these are pin pricks in the lid with the suggestion that somehow somebody has injected something or put something through the lid is a bit premature and a bit alarmist."
Mr Burgess said there was a "robust process" in place for testing tins.
"We have a pretty robust process in place where when these things are brought to our notice police take custody of them.
"We do an immediate triage to see whether there's some urgent immediate action required - if there is then that's followed up.
"If there is indications another container got dropped on top of it and side split then perhaps it might go into a less urgent process."
Information hotlines
If you have any questions about what to feed your baby, call Plunketline 0800 933 922 or Healthline 0800 611 116
For more information go to foodprotection.govt.nz
