Brand new iPhone 12 with glue on the back

I’ve got “brand new iPhone 12” from my loved one, but I can see glue between glass and aluminum on the back of the phone. I don’t trust him, cause this phone came without plastic (in new iPhone’s paper?) sticker on the front, or back of the phone. He told me that he bought this phone locally from the shop. I will add, that he waited extra time (4 days), because “they didn’t have my color” (they did, when I checked their website). I know that you can attach something directly to phone battery, GPS localizer, microphone or something else, can anyone help me with that? Can I check somehow if he is spying on me, or is just a defect?

https://imgur.com/6UoPL7G
https://imgur.com/algXMgc

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