Re: No boxed gifts please
I think it would be less rude to include a message that said,
"We look forward to your company on this special day. Because the bride and groom will be moving soon after the wedding, we ask that the only gift you bring is your presence."
Or something like that.
"No boxed gifts" is presumptuous and tacky. Don't be surprised if your guests feel that way.
that message is perfectly fine... if its truly not about gifts in bags, boxes or envelopes, then why not say it this way to make it clear?