You clearly didn't see the photies on Faceache .
Yes we did get sorted. We bought their cheapo deal of 3 bays for not very much, they seemed a bit flimsy until fully built and one of the packs they sent seemed like someone may have already used.
We also bought their heavy duty workbench which I was a lot happier with, though I have no expectation that the chipboard shelves will last very long as the corners are already a bit battered looking, but maybe I'll replace them with marine ply if the price of wood ever comes down.
I have similar shelving ( dunno who from, it was bought when we moved here mumblety years ago ), and the shelves are all chipboard too.
They are installed in a store cupboard which is more 'outside' than 'inside', and in the garage.
But they are not subject to actual soaking.
I fully expected the chipboard shelves to have exploded into dust by now, but they have not.
They are as sturdy as ever.
So I'd say just play it by ear. I'd not bother re-working the shelves to ply unless it actually becomes necessary.