Was he wearing Zubazz pants??
Seriously, ALL commercial gyms have fucked up plates. 49lbs may be a slight stretch, lol, but most are 44-48.....don't sweat it. So, it's not a lifter's gym with Eleiko equipment, but guys have certainly gotten big and strong using the cheap, fucked up plates at the commercial gym.....even gyms and weightrooms I have been to with good bumpers don't have enough of them for everyone to bench and squat with at all times, they're expensive, so they have the shitty plates for the static lifts, lots of people got plenty big and strong with assed up plates....York, Ivanko, and ''good' commercial brands are usually a little fucked up and not totally accurate.....just don't think about it and you'll be fine, lol.
If you're anal, you could probably weigh 10 of them and mark them somehow so you know, but if they're ever unavailable, you'll have a stroke and get a shitty workout for no good reason, so I wouldn't recommend that.