She had told staff they could keep it until after Anzac Day.
However, neither the phone number nor the email she gave the RSA were valid.
"She told us that her daughter was one of the volunteers who helped to place them around the Tower.
"But that's about all we know," Mr Dalton said.
The poppy has taken pride of place in a vase behind the RSA's bar.
Mr Dalton said RSA staff had received lots of positive comments from club members about the poppy.
"I think everyone is pleased we've been involved in this project, especially as we're ramping up towards Poppy Day on April 17 and 18," he said.