I believe there were no markings on the tag for the Bar Tailed Godwit. As for the Great Knot, I came to the same conclusion. I will be visiting Olango again early next week as the waders are extremely tame and approachable at the moment. I'm on the lookout for Spoon Billed Sandpiper, Little Whimbrel, Spotted Greenshank, Oriental Plover and maybe even Bristle Thighed Curlew, all of which have the potential of turning up in spring.