For those whose invitations have gone out..

What do you do if one or two come back?? Some invitations of FH side have come back because the forwarding has expired! SO mad because FMIL should know her people's addresses IMO I don't want to have my aunt have to keep re calligraphing everything everytime one of these things comes back. Is it ok to put it in a bigger envelope and send it to the address the post office has on there??? With no calligraphy???

I had several invitations come back as well. I then just hand wrote them with a gold calligraphy pen (my colors are Gold and Cranberry). Why bother your aunt when you can just rewrite them yourself and it even looks more personal!