I have always understood 'Best ofβ¦' to mean just that. Someone's opinion of the best scenes of the named actor that have been in full movies - a not-so-subtle way of squeezing more money from old films.
As well as 'The Best of ...' movies you name Stryker has been in at least 15 compilations including stuff like Falcon's 40th Anniversary and Best of All: Matt Sterling. I have never seen a compilation which includes unseen or new footage. I don't know of any Stryker footage later than 2001 (except Tall Tails, where he has a cameo role).
And you would be better off using a more reliable Listing Site