As long as it is over $ 25.00, I'd check with your bank to see if it seems authentic. If it is, cash it or deposit it.
Lots of Class Action litigation results in a settlement divided as follows:
A) Some Charity or three (or whatever) gets a really sweet donation to their cause(s);
B) The lawyers get a payday and may break even - may be even able to give their staff a little bonus; and
C) Members of the Class (could be dozens, or multiple 100s of thousands) get a check that's normally so small, you wonder why they went to the trouble.
The Rationale is this: To discourage The Company from doing this bad thing again - until next time. What does The Company get? The entire file is SEALED so nobody can figure out what the company actually did or what evidence did them in. In a manner of speaking, this group of lawyers has sold out the next group of people who get screwed in the next (similar) situation. The Next Guys have to reinvent the wheel, every time.