I think you can give them back to the bank, and have them dispose of them securely.

Shred 'em. If you don't own your own shredder, ask where you work to borrow theirs. Also, keep an eye out in the paper of on the community bulletin boards where you live. Many banks are holding "shredder fairs" in the spring where low income people can come and have their stuff shredded for free.

For what it is worth, the cost of home shredders has gone way down. Everyone should have one these days. Even the older strip shred ones are fine. No one has the time to go through your garbage and glue back hundreds of paper strips. You don't need to get the hi-tech ones. Destruction is destruction any way you do it.