I don't know abt US postal service, but Canada post has a service where you can redirect the mail received at old address to a new address for 6 months or so. Once you get ur AOR then change the address with them. Check with the local post office.
Sure there is one for US Postal services. you can redirect your postal service to your new adress for 4-6 weeks I remember. you can verify it at your post office. you just need to fill amd mail a new adress card with your old and new adresses - that's it.
Always Hopeful
Hopeful Canadian