Bitcoin themed-tokensthemed tokens - These are a dime a dozen, and sold on common marketplaces like Amazon, Etsy, etc. They're simply metal coins or bars with Bitcoin stamped on them, typically accompanied by a design of a face or circuit board on the back of the coin. They have no identifying marks (such as a hologram, serial number, QR code, or bitcoin address), and asare simply commemorative tokens. They contain no Bitcoin inside them, and are functionally no different from an arcade token.
Commonly, they look something like this
Loaded Bitcoin Token - Loaded tokens have been made by a handful of creators over the years, most famously Casascius. Other makers with sizable quantities produced (and thus more likely to randomly crop up like this) are BTCC, Satori, Lealana, AlpenCoin, and Denarium. Many other smaller series with tens or hundreds of pieces produced exist as well.
Identifying a specific series can be hard without photos, but you can look for indicators that it is a collectible item - it will typically be made of metal (Brass, Silver, Titanium, Copper, and in some cases a mixture of them), Clay or Plastic (usually, these take the form of poker chips from Satori, BTCC, or MoonBits). It will usually also mention the name of the creator (such as "BTCC" or "Casascius"), and come with a holographic sticker on some part of it (for coins, usually at the back - for bars/blocks, usually in one corner of the face). The sticker may or may not have a small window in the middle showing the first few characters of a Bitcoin address). The holographic portion itself may contain some or all of the address, and may be marked with a serial number. You may have to try viewing the sticker from multiple angles to reveal text or finer details, as it may not always be visible head on.
In the event that the token has a unbroken holographic sticker, it is possible that it contains a BTC value - the sticker typically contains a private key behind it, which has an associated bitcoin address. In many cases, this address is loaded. However, several series have been made over the years that were sold as "Buyer Funded", where it is up to the eventual owners to decided whether or not to send BTC to that key.
Redeemed Loaded Token - It is also possible that you have an item which has a holographic sticker that has been peeled (look for honeycomb patterns or the term "VOID" appearing in the sticker), or have had the sticker removed entirely (look for a suspiciously blank spot which would be good for pasting a round or square sticker and stands out from the otherwise patterned/design heavy body of the rest of the item). In this case, any BTC it may have contained is likely gone, but the redeemed item itself may be worth a small amount of money as it is still typically collectible.