thanks for the tips, guys. i think i will end up packing it all myself in plastic tubs and praying...
The tops of the plastic bins can easily pop-off (even the ones that "click" to latch), so I would use two quick passes of packing tape around the "circumference" of each bin (length-wise and width-wise) to ensure everything stays intact. BEFORE SEALING LID, be sure to FILL IN ANY GAPS with bubble wrap or the equivalent. Basically, you want to prevent any SHIFTING/SETTLING of items in the bin (shifting can lead to damage...imagine an item shifting and a third item WEDGING into the newly-formed gap...this pressure can crush/crack).
I moved several times, including 3 times across the country, and I learned quickly that filling in gaps/securing lids with tape were easy fixes
GOOOD LUCK
I imagine your stuff will be shipped via freight (boat)? Are you leaving Germany for U.S.?
YES I AM NOSY
PRO TIP: If you are worried about high humidity, I'd throw some dessicants into each bin (those little packets).