Am new to Lost Media what is the easiest lost media to find?

As others said, contacting people is a start. While not everyone is on social media, talking to people who are established in that area or have connections to those people can help. As an example, I was able to get the status of a lost horror film verified over Facebook by the director and it was a super painless, casual ordeal.

But also do your research to see if something is even lost in the first places. Chances are that it probably isn't, depending on what it is. It just takes time and rolling your sleeves up to find it. Emphasis on the time part because it feels like these days with the booming popularity of the topic, people get far too discouraged early on, throwing their hands up and declare something as lost when they're still taking their first steps. It leads to situations where what they were looking for is found in a very short amount of time, and I do mean very. I've seen people have their "cases" resolved in less than a few hours - or in one recently, under ten minutes. Definitely exhaust all of your other resources and options before defaulting to it being genuinely lost, and in this day and age with platforms like Reddit and message boards still being around, you're sure to find someone who could help.

Another important thing to keep in mind is just because it isn't available for streaming (be it something like YouTube, HBO Max, Spotify, Vimeo, Steam etc) that doesn't automatically mean it's lost either. There is just some stuff that's generally rare or hard to find; especially if it had a limited release (if any), is since long out of print or it's has some form of historical importance and is being secured in some Archive. Like with doing any research, be sure to do your fact checking to make sure things are up to date and accurate.

As for what's the easiest to find, try not to look at it that way. I feel having that mentality sort of takes the fun out of the whole thing. I would say to consider your own interests before diving in. What are you passionate about? Be as oddly specific as you want. There's no limit to it.

Let's say your interests include DOS games, classic literature, and animation (nondescript). That alone opens a ton of opportunities to explore because there's a good amount of content out there, both historical documentation and thriving communities to get guidance from. Also, consider where you are geographically. Just about every country and region has their own lost media - even a local level, potentially. That alone could get you curious to look into things more.

All of this is to say to go at it with an open mind, realistic expectations, and don't forget to enjoy the process. Not all lost or unaccounted for media will be found in a discount bin at a thrift store, a sketchy website, or is just out there in the open. It would be great if it was that simple all the time with easily solved cases, but unfortunately that's not how things play out often. But don't let that discourage you. The days where there are huge breakthroughs are a blast and being able to share it (be it a topic or lead) and just have that space to talk about it is another bonus.