Tetra box built are sold out for a long time on NKD website (only 9) and kits are sold out actually on NKD site, kit price is 383€.
Kit puzzle with 775 parts, 151 mouvements to open the box, a lot of moving parts.
Assembled size: 12.9 cm x 12.9 cm x 12.9 cm
Sell it with the notice construction then you could see all the stages to built it and solution.
Please wait after the auction for the final price with shipping from France, payment by paypal please f&f or wise.
Contact me for any questions ;)