Yes, you will get your original certificates back from the TS EAMCET allotted college if you get a seat in NIT through CSAB round, but the process depends on timing and proper communication.

If you're planning to take the NIT seat through CSAB, you need to inform the TS EAMCET allotted college that you are withdrawing from admission. Most colleges will return your certificates after you submit a seat cancellation request along with valid proof of admission to another institute like the NIT seat allotment letter.

It’s important to not delay the cancellation process, and make sure you have copies of all documents and receipts. If needed, you can also reach out to the helpline of the allotted college or TS EAMCET officials for guidance.