There will always be tips that I forget to post, about the swap.

One is putting labels (usually old ones, and their being return address ones) on letters and packages. I always have a roll of wide clear heavy duty packing tape handy, and always put it over the "send to" address, no matter how good I think that the label will stick. I even put it over permanent marker writing, to prevent smudging.

And Murphy's law rules the swap. If I receive a letter or package where the sender's return address label has fallen off, it's almost a guarantee that there is no written address inside, and no contact info either.

And don't forget to include your USER NAME on this forum! It makes someone's life much much easier if there is a question to ask you.