I think it sounds fine. You have a quick vibrato but that's just a personal thing
that hasn't anything to do with mouthpiece/reed setup. I think you have a real nice
articulation in how you bend and swoop. You have a lot of control for sure. Really nice!
In my opinion mouthpiece/reeds or even saxophones themselves have very little
to do with how a saxophone player is mentally setup and how they've personally conditioned
themselves in playing. I've always used a stock (no name) mouthpiece with a cheap Chinese horn.
My sound isn't great but I do know it won't change from a cheap Simba to a High end Selmer, etc. I've played many types of
horns in my time to empirically know this.
The only thing I do use, of some quality, is Vandoren Java reeds size 3. I always have.
I learned years ago not to get into the hype about setups, which seems that most
horn players inquire about. There isn't a magical formula, in my opinion.
It just takes work to establish a somewhat decent sound. Setups can enhance playing
by aspects of a particular horn's action and response, not overall sound.
Mouthpieces can make it easier to blow pertaining to various openings, etc. But the overal sound will always be there regardless of the setup. That's signature!
Nice of the mailman to give you this.....Possibly you were his 1 millionth delivery? lol.....