I searched in bibliography for some works about readings of ringed birds seen in landfills/rubbish dumps. The only papers found are from Jurinovic and colleagues from Zagabria's rubbish dump. Do you know other similar papers?
See Houston, C.S. 1977 Movements of Saskatchewan banded California Gulls. Bird Banding 48:158-161. available here https://sora.unm.edu/sites/default/files/journals/jfo/v048n02/p0158-p0161.pdf