You should send a letter or hand deliver it .

However I did find last night that the estate owes back taxes for 2018 and that mail is still being delivered to the property which means someone is checking the mail. 

As long as it remains attached to the property, the seller cannot deliver marketable title.

Demo has begun and Lowe's will be delivering items next week.Flooring has been the biggest difficulty to get locked down.

What I Currently Have (fresh out of college):DiscoverIt Card - have had it since December 2018 and use it once a month on a pack of gum.

In that case, unless there have been documented issues I would take the rent in whatever way it was delivered previously..... preferably in person so you can inform them about the new policy and how you want it from then on....plus you get a quick chat with the tenant, quick look at the unit it.

Flooring, Paint, and some minor cosmetics added a fresh look to most of the house allowing me to move in.

I'm thinking there could be a 4 by 4 foot cubby built somewhere along the front that is unlocked until a package is delivered. 

We were excited for the fresh start that we were about to experience - for the first time in 15 years !

The easiest is to write in the purchase agreement that a certain unit must be delivered empty.