[Yardboy12]

They normally take a picture of them leaving it on the reception desk

Well, either the people at reception didn't pass the package over to you, or someone stole It.

Put simply, It was dropped off at the correct address, but you didn't personally receive It.

but sometimes they leave it there even if there is no receptionist.

If that's the case, they've basically DNAd themselves.

Thanks for the help, ur a good guy