I got one of those Thomann ABS cases for my 4003 for Christmas. It's a decent case, and great VFM, though definitely not quite in the same league as some of the other cases being discussed here. Considered getting a Hiscox, but wasn't sure whether a 4003 would fit.
The original Ric case the 4003 came in was the standard Ric ABS case, but had numerous holes in the corners, a missing metal foot, with one of the others having cracks around it. Absolutely stank inside too. Tried dousing the inside with Febreze, but after about a week, the smell came back.
My other basses are in the plywood & vinyl Thomann "classic" cases. Again, sturdy & well built, but not quite up to the standard of the more expensive cases.