I would chance it. You can tell them you will show in your insurance to the barracks if need be.
ya your supposed to be given 10 days, but i was drivin a civic b4 and got stopped and got fined 60euro for non display of disc id say its because they didnt like the look of the car! depends on the guard you meet!
my company wouldnt do that so just got the ref number and put it in the holder till the disc arrived but ya tanz that would be a good thing to do...