Under reference Preiser 28194, here's a couple posting a letter and matching letterbox, in HO 1/87th scale.
Introduction to the manufacturer Preiser,
The Preiser brand offers a wide choice of highly detailed figures in all scales: Ho: 1/87; N: 1/160; Z: 1/120; TT: 1/120; G: 1/22.5; 0: 1/43; I: 1/32.
Preiser manufactures all types of figures that are bound to match the theme of your miniature network (in town, in the country, on holiday, working, etc...). Their models have been designed for several years in Germany and are hand-painted.
These characters can be used to liven up your network and add a touch of originality. The brand also offers seated travellers without legs so you can install them in your passenger carriages for even more realism.
The Preiser brand stands out for the quality of finish of their characters.
These products are generally sold in sets so you can benefit from several characters addressing a specific theme.