My reading was that it wasn't a single poem (by which I think you mean, a single instance of the poem). Apparently this poem was found all over the place, both

My reading was that it wasn't a single poem (by which I think you mean, a single instance of the poem). Apparently this poem was found all over the place, both with and without the final 2 lines, and that basically factories were churning out kitsch with the poem on it for sale.