Just my own view of it but the machine shop does this kind of work as a profession and should allways keep track of this sort of thing. Seems rather careless for the shop to neglect keeping something like this in order. Not to say anything negative about the place or person(s) as I don't know them but an oversight like that should fall back on them. I think if you have a polite but firm conversation with them about it they would end up agreeing. Again, just my personal view of it.