I think that the piece of green glass in the lower right corner looks just like a bike seat. Victor (who just left for 3 days in Philly) collected that one on Sunday; the rest of them I collected earlier in the month, maybe even at the end of March.
Victor was down on the boulevard, not realizing that just a few hours earlier a body was recovered there. Speculation is that the man is one who was last seen in November, promising to go into the water forever. Here there is a literal and figurative undercurrent.