Probably not something they’d have checked.
QR skewers sit in the axle so if they’re dry and flex or rub against the axle, they might creak. Take the skewer out fully and apply some grease along it then reinstall.
If it’s coming from the front wheel when you lean the bike over it could also be a broken axle flexing in the hub. Figuring that out depends on the axle type. If it’s a loose ball bearing type then you could just disassemble and see if the axle comes out in one piece, or not.
Noises move, it might sound like it’s coming from the front but it could be anything really.