Hy mate , it's not an problem   youre level ..open them and you also can upgrade them..but you need a lot of pieces  ...Good luck 

Class 4 Item Common      Uncommon          Rare                  Legendary

Level 1 6048 pieces / ?? 9072 pieces / ?? 12096 pieces / ?? 15120 pieces / 6 hr

Level 2 12096 pieces / ?? 18144 pieces / ?? 24192 pieces / ?? 30240 pieces / 9 hr

Level 3 18144 pieces / ?? 27216 pieces / ?? 36288 pieces / ?? 45360 pieces / 12 hr

Level 4 24192 pieces / ?? 36288 pieces / ?? 48384 pieces / ?? 60480 pieces / 15 hr

Level 5 (max) 30240 pieces / ?? 45360 pieces / ?? 60480 pieces / ?? 75600 pieces / 18 hr

Much appreciated skulder, piece upgrade schedule extremely helpful for long term planning (have been stashing pieces). Is there any intel on which 3 items are included in legendary vs rare package (at level 4)? The upside of these upgrades far outweighs the process of coordinating breaking of pieces. I also saw promo for general's kit to assist. Finally, there is also a complete breakdown of all general's items w associated increase increments available on web via google. May be wiki site I saw (unsure), but it is laid out in color w pictures and extremely detailed for long term planning. Thanks again!

Apologies, the general's list can be viewed if you google "play tamin" Extremely well done & useful.