1st off, I hate you....like really hate you....j/k
Those are awesome decanters, congrats. Basically, once James Bond came to be, there was a shift to clear spirits away from whiskey. As a result bourbon suffered and numerous distilleries went out of business. These decanters were commonplace amongst many distilleries as marketing to sell their whiskey. Jim Beam is famous for these.
Specific to Ezra Brooks, I can't tell you much. Best I can tell is that it may have been produced at the Hoffman Distillery in Lawrenceville, KY. I don't know much about the distillery, but that's Wild Turkey and Four Roses Country. Also, not too far from Buffalo Trace. Really a great region for bourbon.
You should have tax stamp(s) on these. Honestly, there's no telling how much they'd go for if you wanted to sell them. You could scour the internet or contact Justin's House of Bourbon in Lexington/Louisville. I think they'd likely give you a price, and maybe even try to buy them.
From my friends up in that area, they all drool over decanters. Reason being is that they didn't have limited editions or supply constraints back then. Their best barrels just went out on the standard label. So yeah, Wild Turkey 101 was better, they all were.
All this being said, there is concern about lead leeching into the whiskey. So I would proceed with caution if you want to drink. The opened decanter may already be oxidized to hell, who knows. But if you are wanting to drink the whiskey (I would), I would transfer to an empty liquor bottle and then send a sample off to a lab for lead testing. Get the results and research how long it would take you to process that amount of lead out of your system. Then enjoy, if the levels are reasonable. Once the bottle works down to a little above halfway, transfer to a smaller bottle. Or you can use food grade gas (argon I think) to prevent oxidation. There's a product called Private Preserve that people use on wine bottles.
Congrats again. 12 year old bourbon is typically in the wheel house for bourbon. If you decide to open them up and drink them, update us on your process, lead, how delicious they are, etc. And I added a couple links for you below:
Brand History – Ezra Brooks
Copycat Whiskey – the Story of Ezra Brooks and Jack Daniel’s.
Vintage Bourbon Selection – Justins' House of Bourbon
Leaching of Lead into Whiskey from Ceramic Decanter Glazing