It's not really different. Any ammo acquisitions (whether purchased or gifted) should be entered on the recipients FAC.You dont think - but you dont know
Totally different scenarios you highlight above anyway - Client turns up by has the conditions on his cert - the OP does not
The OP is not licenced for that ammo
Nothing causes a problem - until ....it does
Plenty aren't though, as I'm sure you're aware.
As for the OP not being "licensed" for that ammo, well as far as I was aware expanding ammo is no longer categorised separately, so provided that the calibre is correct no eyebrows would be raised.
I agree that nothing causes a problem until it does, but I do think some people spend time looking for problems that probably don't exist.