You may want to pull out the cuircut boards and try selling them on
Ebay. There is a little gold plated on the circuit boards and the dial pad circuits, but not enough to get crazy over. You may get around $10 on Ebay. Maybe. And thats only if you have the right type of old phones. If it were me, I would give it a try for the heck of it. I know the yard near me would just give me mixed metal shred for the lot, but some places may not want them because of the batteries. I would check if there is a market for the specific batteries on Ebay.