Always wise to be careful don't open that door should any ' RM collection' person appear, if they're the real thing they won't mind being told they have the wrong address,  by you telling them this,  through a closed door.

Thankfully,  there are more good peeps in this world than bad,  so this more than likely,  is a simple mistake.

@55dodge55 

Just a thought but have you bought anything recently?

I have had the details of a collection arranged by the seller emailed to me on a couple of occasions in the past.

Yes that can happen, did you get an email directly to your email or was it through your ebay anonoimaised email?

Usually that would trigger a "we tried to collect your item but it was available to collect" email, there are quite a few bugs in the collection system and around here because we are in a not spot and they use vodafone on the PDA's it causes problems.