They're standard capacity magazines, probably for a P228 or P229.
The political term is "high capacity clip", arbitrarily pegged at 10 rounds nationally to coincide with mag bans. In NY an 8 round mag now is "high capacity". In Colorado over 15 rounds is "high capacity". See how that works? The Sig/Sauer mag that actually is "high capacity" is the optional 20 round mag, because it's not a standard mag.
You could run an ad here and put the usual disclaimer that the buyer must reside in a state where such magazines are legal, and it is their responsibility to comply with the law. But states like California, NY, NJ, and the other usual anti-gun states should send up a red flag.
Also, state that you believe they are for a P-228 or P-229 in 9mm, but they are being sold "as-is".
As far as IDing the mags, I've posted a link to a Midway page for them. Also their price is $40 per mag, so if you set yours under that with also taking some shipping and money order costs into consideration, you should be able to get a buyer. Maybe $25 to $30 each if in decent shape. Maybe a bit more if perfect, never used.