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If you're not totally sure, the easiest way to confirm is by taking pictures. Assuming you have L R G B Ha, take a picture of the night sky with the same settings across all the filters.
The L filter will be brighter (higher mean ADU) than all the other filters. You may need to tweak exposures so that they don't saturate the chip (i.e. bunched up against the far right of the histogram).
Likewise, Ha will be the dimmest of the remaining four filters.
To work out the colours, you can just point them at bright, well-known objects such as the Triffid Nebula. The red channel will show the red part of the nebula most prominently/brightly, and the blue channel will show the blue area most prominently. The last filter is therefore green.
You can also work out the colours if you have a (saturated) red torch - just compare the exposures and see which one is the brightest, etc.
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