Just FYI for others because it happened to me 2 years in a row with the BIS paint pack.
You need to buy BEFORE the BIS day the 4 finalists of the BIS if you want to get a BIS skin separately in hangar distributed AFTER IAE.
Buying BIS ships (labbeled as BIS during the BIS day) will NOT grant you a separate paint.
I had to go through support each time to get my paints in 2020 and 2021.
So if you want say a Carrack paint in your hangar, you need to have a Carrack before the BIS day in hangar.
I only need to grab a Scorpius and an MSR (My Carrack cannot be melted, so there's no risk of missing the Carrack or Pisces skins... More Pisces would be nice, however), so was planning on picking them up on the respective event days - The 2 "F5" ships I would love to pick up with credits were the Pioneer and the Constellation Phoenix, with the Pioneer being prior to the Scorpius\MSR sales, so in the unlikely event that I "won" one, it could be melted to release the funds, which would cover the cost of the Scorpius, MSR, and Phoenix.
The problem for me at present is working out whether I should acquire one (or more) LTI STV's\Spirits while they are still available, or if there will be ships at IAE (and in 3.18 shortly afterwards) that I would like more...
It should be OK to melt the ships on\after BIS day to receive the skins while releasing the funds for other uses on the final days, though, shouldn't it?