Cheers for all your cracking advice guys, Ralph you speak sense, I did consider that it was their responsibility but I believe one of our guys signed for it as it was addressed to the company not the customer.
Anyway bit of a ****ty ending (I think) to this episode - nothing. Boss never said a word to me, I was in the office all afternoon, he bought me a pint after work ; had all the opportunity in the world to say something yet he hasn't. Have a sneaking suspicion that either it was my manager that was making the threats and just saying they were from the boss or something'll be said near payday.
PS. found out today in the pub someone got sacked this week. we're only a small company, there's a very high staff turnover and when people come and go there are no introductions or good byes
Bothers me a little.