I still have a UV tube from my Philatelic days, so presumably that would do the job as well.
The only pellet box I have reproduced in any quantity, 20 I think, was the Webley .25 pellet box, with the main giveaway, apart from some having Kellogs writing internally, being the '99 - 66' apostrophes each side of 'Webley'.
The labels on those and my pistol boxes were all laser printed, with no attempt made at ageing.