QEX said if it is unable to recover the stock it will have a material adverse impact on the company's financial performance and net profit this year.
It will also mean subsidiary company New Y Trading, which owns the inventory, will not meet three of its financial covenants relating to its loan facility with banks.
"The company is proposing to liaise with its bankers today, with a view to confirming the ongoing support of its bank in respect of the prospective breaches of covenant, and to seek a waiver of those breaches from its bankers," QEX said in a statement to the stock exchange.
"The extent of the impact on the financial performance and financial position of the company has yet to be conclusively determined by the board at this time," the company added.
The company made no mention of insurance arrangements in its initial statement but said further announcements will be made as information comes to hand.
QEX shares fell 17 cents, or 36 per cent, to 30c.
In June, QEX said it was expecting a challenging first half of the financial year, although there were also opportunities due to the Covid-19 pandemic.
"Demand for milk powder and other New Zealand products remains strong in China, despite the uncertain global economic environment," the company said in its full-year result announcement.
It reported a 38 per cent slide in net profit to $1.2m for the year to March 31, contributing the decline to weaker margins in the first half of the year and costs establishing a new base in Sydney.