Tweaked your search:
| gentimes start=-1 | eval sno=mvrange(0,60) | table sno | mvexpand sno | eval from=sno*1000+1 | eval to=(sno+1)*1000 | map [search your search to export | eval sno=1 | accum sno | where sno>=$from$ AND sno<=$to$ | fields - sno | outputcsv Result.$from$"-".$to$]
This seems to work, thanks again!
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