Bought a Lumix S9 but the package went missing

Hi, everyone.

This is my first post on here and I need your advice and opinions.

I ordered a Lumix S9 with a 18-40 lens and a free 50 f1.8 lens. That's the first time I bought a new camera. The package was shipped by FedEx. On last Friday, I got an email that the package was delivered to my apartment and was signed by a receptionist. Later that day, I went to pick up at the office room but they said they hadn't received any packages from FedEx on that day. So I guessed they put it in the front of the apartment because they put my other packages there before, even though the apartment manager puts a sign warning that they need to deliver to the office room. I don't even know FedEx delivered the package or not because the workers in the office have to put their name for packages that require a signature, but in the delivery proof they just put it signed by a receptionist. Eventually the package went missing, I contacted and reported to FedEx but they couldn't find and closed the ticket, and tell me to contact the shipper. I also reported to Panasonic customer service, but they told me to contact FedEx because FedEx reported to them that the package was delivered and signed by a receptionist, and it's not their fault. It seems like they both don't want to take responsibility for this problem.

Can you guys give me some advice or opnions on this? I appreciate that.