I've done any swap using BKB, can I still do it now and qualify?
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You have not done any swap you mean? If this is the case, yes you can still participate, all you need to do is just to make a swap using the BKSWAP
How does the blindbox work, is it in form of a Lottery and also can be found in the box? I've not used Bitkeep before, but I will give it a shot
No, blind box is not lottery, it like a surprise package which you will need to open to see what's in it and before you can get a blind box, there's are tasks which you will need to complete for you to qualify, and one of those is that you need to make use of the BKSWAP swap.
The blind box 🎁 contains free cryptocurrency