Remote: How to take possession with new lockbox?

[Sam Tright]

Hi I'm buying a property remotely. Currently has a lockbox on it from realtor representing seller. I need to work out how to take possession with another lockbox put on it with my own key.

I have a local contractor. My current thought is to have him buy another lockbox and put it on at closing.

Or do I get the key to the realtor's lockbox at closing (I assume it goes to the underlying door)?