The 2kr postcard is H&G 48 issued in 1983. This has the heading in German and Czech.
The 5kr envelope is one of H&G 42 to 45 issued from 1890 to 1894 depending on whether the paper is white or buff, the bottom flaps on the back are under or over the side flaps, and there is or is not a round colourless embossed seal on the top flap!

The 5kr letter card is H&G 27 issued in 1890 again with the heading in German and Czech.
H&G is the Higgins and Gage World Postal Stationery Catalog Section 1 last updated in 1982.