Thank you for the info. This is actually a non-syringe kit it comes in a pre-inoculated substrate and is supposedly ready to go. The company also supplies all the buckets and bins. In retrospect I may have been better off controlling the environment from ground zero using my own substrate and inoculant. So much for taking the "easy" route

I do agree that it is possible that airborne contaminant was the issue - but all four bins seems unlikely. I probably would have been less annoyed had they been helpful rather than sending a form letter with a 60% off coupon - almost like this happens all the time. In this case the company has every financial incentive for the first batch to fail so buyers must purchase a second batch.