Then contact another Australian collector who might have a spare. I have no idea what Aussie customs does with knives like LB-7's, but eBay is loaded with them 24/7, and they go for as low as $25 U.S. plus shipping.
Michael
PS- The LB-1 knives with the UH signature are circa mid-80's - 1996, an approximate ten year spread. Logos and such on packaging can narrow the dates more.