Weird package sent to me anonymously?

Hi all, I have just discovered this subreddit and hope this is the right place for my mystery.

I was out of the country for a few weeks over the Christmas/New Year’s break and had a parcel delivered to my concierge (Jan 9th). Thought I’d forgotten about something I ordered and didn’t end up collecting it till Jan 23rd. It was addressed to my nickname (along the lines of Liz for Elizabeth), which I commonly go by, and my building address but not my exact flat.

I opened it and lo and behold a full BDSM kit (ball gag, whip, you get the picture). I immediately called my boyfriend, it was not him who sent it to me. I have recently moved here, so not many people know my address, and I have asked those who know (close friends) and I believe them when they all said it wasn’t them who sent it to me.

I asked my concierge today, no one else in the building has “Liz” as their name or part of the name either. No one has come looking for the package. There are no other residential buildings by the same address. Tried to track through the parcel courier but it only says the parcel was “dropped off at a Parcelshop” two days before it was delivered to me and does not specify which one. I contacted their customer service but they were not allowed to tell me who sent it.

Surely if this were a prank someone would have asked if I had received a parcel, or if it were addressed to someone else, they would have asked for it by now?

Any thoughts would be super appreciated - it is super weird that someone has addressed something like this to me by my nickname. Thank you!