Containers for rod-like articles are provided with a device, e.g. a transponder, capable of carrying variable coded information. Read and write devices are provided at appropriate positions, e.g. tray fillers and unloaders, to ensure that only containers of the correct type and contents are passed for further processing. The coded information may also relate to time of manufacture or loading, particularly where the articles are filter rods, to ensure unloading of only those containers in which the rods have received adequate curing time. A buffer reservoir system having a tray filler, tray unloader, and a tray handling system includes a transfer member capable of transferring trays between different positions of the tray handling system and a static trolley. The transfer member may comprise a robotic or other programmable member.