I can’t reach the top either.
I do one of three things.
Try to go when mail personnel is there and just knock on door in back and ask them to get my mail for me. Never had a mean response from them.
Or put a step ladder (I like three step one ) in trunk or strap to golf cart with golf club straps to use when I get there.
Or wait for tall person to get my mail for me. Only had one jerk respond with mean remark about size, but that is their problem not mine. I even traded services once and helped tall person get mail out of bottom box because they couldn’t bend over.
Welcome to The Villages.