I found these flower pots in a crawlspace. Should I keep them or donate them?  

Donate,
or just put out with the trash. There are already lots of pots like that at Goodwill.

I'd probably
put some "spent" cigarettes, some loose change, and a couple of worn out naughty pictures into them...and return the vases to the crawlspace for the next owner to find.
........
Aunt Mark

For what it's worth...
the other name is Haeger

Dear Aunt Mark,
I'm going to remember your suggestion next time I find vases in a crawlspace.
Happy Mother's Day!

Thanks robert1960. I think...
Thanks robert1960. I think your information is worth more than these pots.
They are going outside until I find a better place for them.

Not my favourite, but why not...
Not my favourite, but why not offer them really cheap on Craigslist?
The reason I say this is that there are people who would like some mcm looking type things in their home and much of it is expensive now. Someone would find it fun to find some inexpensive mcm on CL. Offer the lot for 5 bucks or something. Maybe some kid just starting out his/her collection will be into them in their kitchen. They aren't worth much.

I agree with keewee's sentiments, but...
... I'd donate them to Goodwill and give that kid the extra satisfaction of a thrift-store find.