TexasCHLforum.com

Aimsurplus.com has some LE Trade in FN FNS 9mm's for sale. 299.95

https://aimsurplus.com/le-trade-in-fn-fns-9mm-pistol/

Not sure if this is a great or good deal but looks good at least!

From the website

Condition: Used
Gently used law enforcement trade-ins. These pistols are in great shape as the pictures show and have minimal wear if any. Includes factory box and 1-17rd factory magazine. More information below.

Used with night sites are going for $390 on gunbroker.
So, I would call this a good deal. Not great, but good.

likely all the guns sent back after they were recalled for potential ADs. Several departments dropped them and went to something else if I remember right.

You are correct. Classic firearms had a big shipment of them as well and did a video. These guns are basically brand new. Most never fired. At least from the batch they had. But I bet they are the same.