I have experience only with a pair of Thiel 2.2's, and the shipping containers may have changed in later models, but I discovered a real flaw in the way the cartons were put together.
The carton was designed so that the base of the speaker slipped down over two pieces of very thick corrugated cardboard which had been glued on edge to a piece of plywood in the bottom of the carton. It became clear, after my speakers arrived damaged, that any kind of impact from the side would break the glue bond and the vertical pieces of cardboard would fall over sideways, leaving the speaker with about three inches of sliding room. The result of that was damaged veneer on the top corners.
The point of all this is to warn anyone with Thiel cartons in your attic to check the way the base of the speaker is supported in the bottom of the carton and figure out something to better support the base if you need to ship them. The usual way of packing the speakers by laying the boxes on the floor and sliding the speaker into it doesn't give you a good view of what's in the bottom of the carton. Best to check.
The carton was designed so that the base of the speaker slipped down over two pieces of very thick corrugated cardboard which had been glued on edge to a piece of plywood in the bottom of the carton. It became clear, after my speakers arrived damaged, that any kind of impact from the side would break the glue bond and the vertical pieces of cardboard would fall over sideways, leaving the speaker with about three inches of sliding room. The result of that was damaged veneer on the top corners.
The point of all this is to warn anyone with Thiel cartons in your attic to check the way the base of the speaker is supported in the bottom of the carton and figure out something to better support the base if you need to ship them. The usual way of packing the speakers by laying the boxes on the floor and sliding the speaker into it doesn't give you a good view of what's in the bottom of the carton. Best to check.