It depends if the number of them existing matters.
I went to several games trying to see Yaz 3000th hit. First couple were reserved grand stand, then a bleacher seat or two, then SRO. Fenway sold thousands of tickets to those games, sellouts or near sellouts. I only switchd because I was running out of money. But I'd be surprised if there were more than 50 SRO tickets sold. And those were throwbacks, like 30's -50's tickets. Not as good looking as the regular ones.
Same for my first Mets game in Shea. Cousins got tickets from a local dairy promotion with the dairy name and I think log printed on them. Hardly anyone was there. Seats were supposed to be in the last 5 rows of the upper deck BUT...The Usher said that day it was reserved for firefighters. For $x per seat he'd find us a spot in the next deck down.... Fun times. The next game was totally different. Lower box seats dad got from someone he knew through work. Asked where they were and got the star treatment....
Like right this ways sir, guided to the seats, not allowed to sit until the seat was wiped off... Plaque bolted to the railing says "this box property of the Coca Cola Corporation. " Oh, that explains a lot. I don't remember if it was on the tickets. Someday I'll find them. I do know that fenway season tickets in the late 70's early 80's had the ticket holders name on them.