Yesterday i purchased a used mesa 2x12 cabinet from guitar center for $400. I asked the guys working there what speakers were in it and they thought they were some type of Celestions, but they werent completely sure. So how can i find out for sure?

Also, on the back of the amp it says "CEL-30, COMBINED POWER CAPACITY 140 WATTS"

Thanks for any help
Well on the tag it says "Model: 2FBB-R" but im not sure what that means. And would opening the back of the cab really be safe? I dont want to damage it in any way.
picture? looking at the back of the speakers would get you the answer for sure.
Gibson SG Standard + 18volt EMG-81 & 85
Mesa/Boogie Mark IV + Recto 2x12
Keeley Modded BD-2
Vox V847a
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Recognised by the Official EG/GG&A Who To Listen To List 2008
Well i just opened the back and...theyre Vintage 30s! I thought they were but i just had to be sure. Thanks for the help.