The best replacement for seen is saw.

The best alternatives to seen are rated as following:
★★★★★  saw
★★★★  scene
★★★  seeing
★★★  saw grammar
★★★  seem
★★★  i saw
★★  watched
★  saw worksheet
★  shown
★  seen
★  saw when to use
★  heard
★  touched
★  saw english
★  see
★  saw grammar girl
  saw past tense
  have saw
  have seen
  had saw
  did you see
  be seen
  we saw

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Speaking about seen, one probably shouldn't forget about seeing.

Other search terms related to seen and their ratings are:
★★★★★ seeing
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Google Trends

Scale is based on the average worldwide traffic of seen in all years. Click on graph for more.
seen
saw
scene