If I went back and found the keet either sitting on the same egg or not sitting on anything at all, first I would go to the manager and find out what they intended to do with the bird. Then I would kindly but curtly inform them of bird needs.
If that didn't work, I'd call in other people.
I did that once with hermit crabs at a local petshop that sucks. I won't describe the conditions for those poor things they were so terrible. But I hounded the manager until they put the remaining crabs in an appropriate environment...I noticed that they stopped selling hermit crabs after that.
Bastards. Pet stores can be wonderful, but they can also be the worst thing on earth. Innocent animals as commodities-not good for the animal involved.