I actually have 3 petco snakes. One is very flighty because of a series of mistakes I made that led to a 6 week hunger strike followed by many months of on again, off again, eating. I didn't handle her because she seemed less likely to eat then. Ferenea is now getting much better with being handled.
Dier, my almost-sunglow, is also a petco snake. She's one of my most docile snakes and always has been. Yes, she did have mites I believe that spread to half my collection... but that has been fully dealt with now.
Vanay, my mystery corn, is petco too. No mites, great appetite, and healthy as can be. She too is getting used to being handled.
A lot of very young corns are going to be flighty/bitey. You look like a giant predator to them. The trick is to remain calm with it. Giving them a good 3 to 4 days to settle into their new viv without handling also seems to help.
The treatment also varies from store to store. I haven't browsed my petco for several months because they had a *very* ill garter snake... emaciated... that when I pointed it out they said "It's eating so it's fine.".... :fullauto: It all depends who happens to be in charge, as this incident happened with a relatively new person. When I noticed two corns with injuries many many many months ago, they immediately removed them from display to treat them and I didn't see those snakes for several weeks. When they were back, they were better.