What is the current state of the law on seizure warning stickers?

9 Cf. United States v. Harris, 521 F.2d 1089, 1093 (7th Cir.1975) (warning stickers on seized automobile were "formal indication that the car had been seized"); United States v. Main, 598 F.2d 1086 (7th Cir.) (verbal notice that vehicle was seized and tearing of seizure stickers from rental property), cert. denied, 444 U.S. 943, 100 S.Ct. 301, 62 L.Ed.2d 311 (1979); United States v. Scolnick, 392 F.2d 320 (3d Cir.) (breaking of bank window, removal of seizure seal on box, and removal of safe deposit box and contents from bank), cert. denied, 392 U.S. 931, 88 S.Ct. 2283, 20 L.Ed.2d 1389 (1968).