When I asked grandma about the tags, she also told me not to touch them.
The sticker on the dash is obnoxious, and will come off with the help of a hot air blower. The stickers are there for importation/federalization, not inspection, it's really unlikely you'd encounter a problem at inspection time.
Offer the stickers, they're a nice idea...but not for some vague..and vaguely scary...fear of what would happen in their absence, unless you have some statue to quote.
