I just bought a used MacBook on eBay and the seller has contacted me advising me not to turn it on for 24 hours once I've unpacked it as the courier will have stored it in cold temperatures and it would need to acclimatise before being turned on in case any damage is caused by condensation on the change of temperature. Is there anything in this? I've had laptops sent to me in the past and never given it a second thought to be honest and never noticed any ill effects. Is he just being over protective or is it good advice? Obviously I'm keen to get my grubby mits on it the second it arrives!