What was in Martin Rushent's car boot?

I'm reading From Joy Division to New Order atm and I just came across the bit where Hooky is talking about when JD were doing some demos with Genetic's Mr Rushent and were impressed by his expensive car. They opened the boot and...

"I can't say what was in the boot, but we were stunned. In fact, at one point we thought about nicking a couple of them, but our bottle went. I'll have to leave that to your imagination."

Any theories as to what it was?

some kind of powder no doubt, in bags

and probably white of colour

chinese rock?, he chimed in.

It was a family of Gnu's

Twinkies

Perhaps it was....PAPERCLIPS!

(no, i won't post a photo)