Hospice shop staff had managed to contact some of the soldiers' family members, but the question of who the album belonged to had gone unanswered.
"The families recognised the family members in the album, but no one knows who dropped it off," the spokeswoman said.
Hastings Cranford Hospice Shop retail manager Anke Hoggett-Schnebeck said staff wanted the album's owner to come forward.
"When we receive items that cannot be sold, such as this photo album, we will make every effort to care for the memories that this item holds, and if possible, track down the families who may want to be reunited with a piece of their heritage."
There will be a showing of the album at the hospice shop at 1pm tomorrow. Some of the family members connected to the album will be there to see the photos for the first time.
The showing is open to the public.