Data collection from amazon- 5000 products- Manually Done

We have a list of 5000 product SKUs on a spreadsheet to be uploaded on Amazon. We need freelancers to search for the products and collect from the Amazon page the ASIN, weight & Amazon category of the product. The products belong mostly in the electronics and musical instruments categories. And usually easily found on Amazon. This task must be done manually, the product must be identified by someone with common sense to choose the correct product out of the search results. Choosing the correct product is the most curtail part of this task, THERE COULD BE NO MISTAKES AT ALL. Many times when searching for a product at Amazon, the search results will include other products with similar model numbers, as well as duplicated listings created by other sellers. Sometimes the model numbers will be very similar with only a couple letters difference such as bk, bl, sl 500 is 600. And the correct item not always shows on the first or second result. Sometimes sellers create their own packages and sell them with the same SKU in their title. We need freelancers with a lot of common sense, and the ability to be extremely accurate. (Familiarity with this type of products is a PLUS) If you can not find a product or extremely unsure about which result to choose, the item must be highlighted. There could be no mistakes involving this task, each mistake could mean loss of funds and customer satisfaction to our company. We almost lost our Amazon account in the past due to mismatches between the SKU and the correct ASIN. To insure there are no serious mistakes which could only be discovered over time. A 1/3rd of the Payment held against the guarantee of the work to be 100% perfect. It would be released after two weeks unless there is a serious mistake (example: We sold a product below our costs due to a mistake) Please place your bid for per sheet (500 Products) and how many sheets are you willing to take on. We will select several freelancers with good feedback history as we would like this project done in 10-15 days. Happy bidding :-)