Unwilling third party - what is my responsibility here?!

Someone had a parcel delivered to my address, but not to me. I think it's the people who lived here before me.

I emailed the Sender, to tell them to let the Customer know that I will keep it safe until they come and get it.

The Sender said "can you print a new shipping label and take it to a post office?" This is a pain for me, because I don't drive.

I tried to contact Evri on their "tell the computer all of your details" whack-a-mole, so now my details are linked with this parcel as if I am the Customer.

I'm just an unwilling third party, and I don't want to be accused of stealing this parcel. I would have been ABSOLUTELY FINE with someone coming to get it, but asking me to donate time to walk to the library to print the new label and then walk this (quite large 5kg) box to a post office... (I am visually impaired and can't drive). It's not what I need on my day off.