It isn't possible. The printer has no idea when you are done scanning,it has no idea if you are going to do another scan, it can't possibly send a command/file stating it is done something when it doesn't know if it is done.
If Xerox even tried to do so, someone would complain that it sent the file too fast, they only paused for a second when interrupted by a co-worker and now their whole job is ruined, they might lose their business and may as well just go live in a ditch tomorrow.
And yes, most support staff in most companies have got that call near exact.
Your software should be able to see the files immediately on transfer, but do to the .lck files, it won't be able to move or rename them until the lock file disappears. (Which is exactly how it works when you transfer a file from your PC and somebody tries to move it or rename it during transfer)