1. Yes, in my view the claim is worth pursuing, particularly for Duty Drawback, although the position for RoDTEP is more fact-sensitive.
Under Section 149 of the Customs Act, 1962, a Shipping Bill can be amended after export, subject to the statutory requirement that the amendment is supported by documentary evidence which was in existence at the time of export. Hence, the fact that the 2023 shipment was initially filed as a Free Shipping Bill does not, by itself, permanently bar a subsequent claim.
For Duty Drawback, the position is relatively stronger. CBIC Circular No. 36/2010-Customs recognises conversion/processing of Free Shipping Bills for eligible drawback claims, subject to the prescribed conditions. The Circular's three-month period from LEO is a significant departmental objection, but there is judicial support for the proposition that Section 149 itself does not prescribe such a limitation and a circular cannot necessarily curtail the statutory power.
For RoDTEP, the case is more difficult because the exporter was required to make the relevant RoDTEP declaration in the Shipping Bill. If the original SB contains RODTEPN/no claim, Customs may object. Nevertheless, amendments for inadvertent omissions have been considered in judicial and departmental practice where contemporaneous documents establish eligibility and the omission was procedural.
The non-registration of the AD Code in 2023 is not, by itself, necessarily a substantive disqualification from Drawback/RoDTEP eligibility. It should instead be explained as the reason the urgent shipment was filed under Free SB, supported by contemporaneous correspondence with the Customs Broker, if available.
I would first obtain the complete 2023 Shipping Bill and verify: (i) RoDTEP declaration, (ii) HS code and applicable rates, (iii) examination report, (iv) EGM, (v) export value, and (vi) whether any other export incentive was claimed.
Conclusion: Duty Drawback appears reasonably defensible; RoDTEP is more litigation-prone but should not be dismissed without examining the actual Shipping Bill and contemporaneous documents. A properly supported Section 149 representation with alternative prayers for Drawback and RoDTEP would be the appropriate course.