I wish Marantz and Denon would stop pasting those stickers on the front panel of the avr. It makes the units look cheap with all that advtg which was rampant in the 80's and 90's on TV's and VCR's.
Instead of wasting money on stickers, they could have printed user manuals which are more useful.
Covering the input jacks is a bit too ocd for me.
However, there’s one thing I’ve been doing with my speaker grilles for years: using the packing material as an extra layer of protection against dust. Since I never listen to music with the grilles on, it works just fine for me.