Local Driftwood Safe to Use?

Wonderful large driftwood from TVA lake

Well aged and weathered cedar is fine in a fish tank.

I have several beautiful pieces that had been submerged half of every year in a TVA lake for decades. I believe they are cedar. They are white almost when dry, but a dark, blackish gray when soaked. They are hard, no rot at all and obviously been worked over very well by the off-on water action. Several of them are 3 plus ft long, wonderful, really. Too much for me to use. Is there a market for them?
 
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