Yes folks I’ve now found out that’s where the majority of the Brick data is stored. If you want to find yours you’re going to need to look into wp_postmeta table.
I ran the following SQL to find mine
SELECT * FROM wp_postmeta WHERE meta_key LIKE "\_bricks%" ORDER BY post_id ASC
(A quick translation - show me all the rows where the meta_key field starts with _bricks)
I had 790 entries in there.
Hope it helps someone else