Hello! I'm going to by some Lealana physical bitcoins from a re-seller.
How can I check that it is still funded, before giving the money?
Ask the seller to take a photo of the coins with their username and today's date. Each coin has an address on the back, from the photo get the addresses of the coins you wish to purchase then check those addresses on the blockchain. This will show you the balance.
http://ltc.blockr.io/ or any litecoin explorer will work.
Another thing to check for is any tampering with the hologram (on the back of the coin). Give yourself enough time to inspect it visually to see if there are any noticeable marks showing any signs of tampering.