I had the same thing happen last week with - seriously- with a 2021 Panini Prizm blaster and Topps Chrome- both baseball. I couldn't believe I found 1, let alone 2 boxes for retail so I didnt wait to open them. The Panini box was a bust all around and the pack that felt thin had only 2 cards and neither were inserts, parallels etc. The box didn't have any numbered/SP cards, autos or memorabilia either. I tried to file on their website but (not surprisingly) the website kept crashing or kicking me off asking me to log in again. This is after being completely denied and ignored for my 1st auto redemption card back in December and a second two months ago.
The Topps Chrome pack that felt thin had 3 or 4 cards but since I pulled a redemption card for Sam Huff auto in the next pack I decided to leave it alone. I didn't mean for this reply to be so long but if you read this far- thanks for hanging in and my apologies for the time it took ;)
Let us know if you figure it out and Good Luck with the box overall- maybe it is a "glitch" since it happened to both of us. I'm in Wilmington, NC but they're probably all shipped from the same place so location may be irrelevant.
Have a Great Weekend Everyone!!!
Becky Elizabeth