Bourbon barrels cannot be reused for bourbon, bourbon must be aged in new white oak barrels that are charred. They have been reused for scotch and wines for years.
I believe their biggest market is Japan, of all places.
I was on a ferry to Islay, ground zero for the best whisky in the world, to kill some liver cells with a dram or two.
I chatted with a bloke onboard, he had driven on a large lorry that was loaded with bourbon barrels from the US. Each barrel was knocked apart for transportation and numbered for reassembly once they arrived at the distilleries.
The frugal Scots will use them over and over until all the tannins have leached from the wood, they then chop the barrels up to smoke their salmon, herring, etc.