Dollar Tree says it completed its Oklahoma Distribution Center expansion under-budget and on-time this quarter which will contribute to overall future growth. Sees FY13 Cap-Ex $340M. Says 6 fewer holiday season shopping days will be $25M sales challenge in Q4. Says on track for new-store opening plan for FY13, which includes 340 new stores and 73 relocations and expansions for a total of 413 projects in 2013. Guidance assumes a tax rate of 37.7% for Q4, FY. Comments made on the company's Q3 earnings conference call.