Just a thought
Why not pull the lock set out of the washer and dryer take over to a locksmith and have them re keyed?
That way you will know if someone has a key or if they are by passing the system some how.
Darcy
Ran across this website, and thought it would be a good one to share.
Nice little survey`s on rental vacancy and costs in some of the surrounding towns.
Hope I have put it in the right forum.
Click Here
Darcy Brown