Biosecurity officials tried to avoid testing 2.3 million rogue strawberry seeds because they were worried it would make them look bad.
They told Ministry of Agriculture and Forestry boss Wayne McNee there was "no purpose" in testing because if a virus had come in with the seeds, there was nothing they could do before it spread.
"If viruses are present, then this will only further highlight the perceived failings of MAF over the clearance and potentially further alarm stakeholders," wrote biosecurity response manager Glen Neal.
The emails, released under the Official Information Act, reveal a "perfect storm" of failures which led to about 8000 ready-to-grow strawberry kits going on sale at The Warehouse.
The kits were made up of dirt from India and seeds from China and packaged in and shipped from Holland without being properly assessed.