I know that it has been said by all of the experts that the accumulator bowls can/will lose their charge just sitting idle on the shelf, but I have yet to read on any of the turbo Buick boards or hear 1st hand that someone installed a accumulator bowl that they knew to be brand new, never installed original and that it had bled down or leaked. I am not saying that it can't happen, but that if it does it is such a small percentage to be inconsequencial. I have 2 brand new in the box hidden away and I am 100% confident that when my 18k mile one goes out, they will perform without a hiccup. Also, Kirban's has brand new manufactured ones slightly different for around $160, I believe. I believe that they carry a guarantee.
That's just me, though.
HTH