Minimum temperature for nepenthes during transport

[pmatil]

Hi, the search didn't find anything so here goes. What is the minimum temperature for (lowland) nepenthes during transport? Someone has told me along the years that the minimum temp is 10C (50F) when ordering plants by post. Is this true and how strict the limit is? I have an order on hold from CZ until the night temps in here are at least 10C (50F). Currently most of the nights are 10-15C but there are also some nights at 5-8C. What do you think? Thanks!