ADAMS TWP — A mail mix-up has caused the disappearance of 3,500 surveys sent to residents of the Mars School District. The school board at their Oct. 2 meeting approved the mailing of 9,582 surveys regarding the current teacher contract negotiations to each household in the school district to get their views on the situation. The surveys were delivered to the Mars Post Office on Oct. 9, and included a response deadline of Oct. 29 for their return. But 3,500 residents in Valencia borough and Middlesex Township, both of whom use the Valencia post office, did not receive their surveys due to the survey’s automatic processing at the Bulk Mail Center in Warrendale. Mars’ director of communications, Josh Schwoebel, said on Thursday the envelopes containing the surveys were addressed and packed into bundles of 50. Each bundle was tagged with the municipality it was bound for, but individual envelopes were all addressed to “Mars.” When the tags were removed at the Bulk Mail Center, the automated processing equipment sent all surveys to the Mars post office. Then the 3,500 surveys disappeared, and still have not been found. “The post office lost them and we can’t get them back,” Schwoebel said. Schwoebel said the deadline for return of the surveys has been extended to Nov. 12. He said any district resident who did not receive a survey should call 724-625-4589.