You just abuse the ticket system.
2016-09-04 opened over 50 Tickets. I have sent 4x S9 hashblade with one Ticket without problems.
The only limit is the maximum package weight. 20 or 30 kg depending on the shipping company.
The disturbing part as that the OP tried to contact them in several ways to figure out how they could make it right and they blew him off.
Dear colleagues,
Earlier, this year I was doing like TUPSU - collected 5-10-15 boards during week or two and then sent them together in one parcel.
But it happened again and again that the parcel remained uncollected at carriers destination until the 90day warranty period was over.
Coincidence? don't think so..
I got tired explaining to some random service manager that I opened a repair ticket for some hashboards inside the warranty period, and I also added photos of the bad hashboard when it broke, of course with serial numbers.
So after my many request how to deal with already expired warranty period bitmain service proposed me to send every blade as soon as possible when it goes down and not to collect them in quantity!!!!!!
Peeps, its a BIG CHINESE WALL of unwillingness to understand (or just doing what it is told by some greedy manager on the top of it all) and abusing customers minds with answers : sorry the hash boards you sent are already out of warranty and you can pay for repair or forget about it.
SO even after I payed for the non warranty repair in the parcel that returned to me from China I find 1/3 of repaired gear doesn't operate at all!
That pretty rough behavior..they act like its the last day of the company and there will be no tomorrow to face all sh*t they dropped a day before.
I don't even count the lost of BTC bcs if I will it will be a really huge amount. Currently up to 70 hashboards from s7-s9 are still in China. The price is dropping for the gear that is away, its not mining and even if it will return repaired good it will never cover the repair and parcel price. My local customers demand their repaired s9 boards and I have nothing to return them..but excuses and will have to compensate it now or in near future.
P.S.
I will add that still there were bright moments in early September for example when I received over 20 s7 boards repaired and all operating good!
But I wouldn't start this topic if the situation wasn't critical as it is now.
P.P.S. @ Dogie: You can keep your pre-payed bitmain advocacy to yourself, unless you can offer some real help in solving this situation.